CASP (Critical Assessment of Techniques for Protein Structure Prediction) is a protein structure prediction competition that is held every 2 years, with labs from around the world testing out their newest state-of-the-art folding methods on unpublished structures. CASP ROLL is a "Rolling" CASP, which happens continuously in the time between the main competition. More about CASP ROLL here: http://predictioncenter.org/casproll/